4-[Methyl-(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-quinoxaline-2-carbonyl)-amino]-benzoic acid 2-trimethylsilanyl-ethyl ester

methyl 4-[1-methyl-2-(5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-quinoxalinyl)-1H-5-pyrrolyl]benzoate

methyl 4-[5-(5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-quinoxalinyl)-2-furyl]benzoate